我創(chuàng)建了一個 2d 切片并從后端數(shù)據(jù)庫填充它，但是由于 json.Unmarshal 僅接受 []byte 作為第一個參數(shù)，我如何將我的 2d 切片類型轉(zhuǎn)換為 []byte。這是供參考的示例代碼，因為我無法共享內(nèi)部代碼：package mainimport ( "encoding/json" "fmt" "io/ioutil" "net/http")//User sjdtype User struct { EmailList [][]string `json:"emailList"`}func listHandler(w http.ResponseWriter, r *http.Request) { reqBody, _ := ioutil.ReadAll(r.Body) var user User json.Unmarshal(reqBody, &user) el := user.EmailList keys := make([][]string, 0) json.Unmarshal([]byte(el), &keys) //this line not working because []byte(el) not possible fmt.Println(keys) w.Header().Set("Content-Type", "application/json") w.WriteHeader(http.StatusOK) w.Write([]byte(el))//this line not working because []byte(el) not possible}func main() { http.HandleFunc("/", listHandler) http.ListenAndServe(":8080", nil)}樣品要求：{ "emailList": [ [ "akki@gmail.com", "bakki@gmail.com" ], [ "lakki@gmail.com", "jakki@gmail.com" ] ]}
1 回答
慕容3067478
TA貢獻1773條經(jīng)驗 獲得超3個贊
UnmarshalJSON[]byte作為user. Marshal user.EmailList以 JSON 作為[]byte. 例如，
package main
import (
"encoding/json"
"fmt"
"os"
)
type User struct {
EmailList [][]string `json:"emailList"`
}
func main() {
// rBody, err := ioutil.ReadAll(r.Body)
rBody := []byte(`
{
"emailList": [
[
"akki@gmail.com",
"bakki@gmail.com"
],
[
"lakki@gmail.com",
"jakki@gmail.com"
]
]
}
`)
fmt.Println(string(rBody))
var user User
err := json.Unmarshal(rBody, &user)
if err != nil {
fmt.Fprintln(os.Stderr, err)
return
}
fmt.Println(user.EmailList)
wData, err := json.Marshal(user.EmailList) // wData is []byte
if err != nil {
fmt.Fprintln(os.Stderr, err)
return
}
fmt.Println(wData) // wData is []byte
fmt.Println(string(wData))
// _, err = w.Write(wData)
}
游樂場：https://play.golang.org/p/S3HWiTqz--B
輸出：
{
"emailList": [
[
"akki@gmail.com",
"bakki@gmail.com"
],
[
"lakki@gmail.com",
"jakki@gmail.com"
]
]
}
[[akki@gmail.com bakki@gmail.com] [lakki@gmail.com jakki@gmail.com]]
[91 91 34 97 107 107 105 64 103 109 97 105 108 46 99 111 109 34 44 34 98 97 107 107 105 64 103 109 97 105 108 46 99 111 109 34 93 44 91 34 108 97 107 107 105 64 103 109 97 105 108 46 99 111 109 34 44 34 106 97 107 107 105 64 103 109 97 105 108 46 99 111 109 34 93 93]
[["akki@gmail.com","bakki@gmail.com"],["lakki@gmail.com","jakki@gmail.com"]]
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